40
RT-SVX063G-EN
Figure 21. Pressure sensing
Top Port Connection
Outside Air
Pressure
Sensor
2' x 3/16" OD Tubing
Factory Provided
Pneumatic Tubing
(Field Installed)
Sensor Mounting
Bracket Attached to Roof
Tubing Connector
(In vertical support)
To Calibration
Solenoid
Return Plenum
Transducer
LO
C
C
Calibration
Solenoid
Sensing Tube to
Space Sensing
Location
Sensing Tube to
Outside Air Reference
Sensing Tube
to Discharge Static
Pressure Sensing Location
NO
NO
NC
NC
HI
LO HI
Sensing Tube
to Return
Plenum
Space Static
Transducer
Duct Static
Transducer
LO HI
Duct, space, and return plenum pressure transducer tubing schematic
Refrigeration System
Condensate Drain Connections
All condensate drain connections must be connected to the
evaporator drain connections.
A condensate trap must be installed due to the drain
connection being on the “negative pressure” side of the
fan. Install the P-Traps at the unit using the guidelines in
Figure 22, p. 40.
Figure 22. Condensate trap installation
Post
4.5”
2.25”
Cleanout
Plug
Field Supplied
Condensate Piping
1.25” NPT
Female Connection
Pitch the drain lines at least 1/2 inch for every 10 feet of
horizontal run to assure proper condensate flow. Do not
allow the horizontal run to sag causing a possible double-
trap condition which could result in condensate backup due
to “air lock”.
Figure 23. Condensate drain locations for units with
stacked indoor coils
Installation
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